Because bodies would oppose an increasing inertia to the causes which would tend to accelerate their motion; and this inertia would become infinite when one approached the velocity of light.

These considerations on mathematical physics are borrowed from my St. Louis address.

I here use the word real as a synonym of objective; I thus conform to common usage; perhaps I am wrong, our dreams are real, but they are not objective.

See Science and Hypothesis, chapter I.

'The Foundations of Logic and Arithmetic,' Monist, XV., 338-352.

Second ed., 1907, p. 86; French ed., 1911, p. 97. G. B. H.

Revue générale des sciences, June 30, 1905.